I believe the medical community is NOT 100% knowledgeable about HPV and how it spreads.
Obviously, when sores/blisters are present, the puss from the sores/blisters are extremely contagious, even a man's sperm (so don't let a guy experiencing an outbreak cum on you).
Not only is it highly contagious, it can be spread to other sensitive areas of the body, most notably the eyes!
So washing one's hands immediately after any possible contact with the infectious area (i.e. using the restroom) is extremely important!
Before sores/blisters are visible, there will be warning signs in the area-to-be of 'infection'. This is where the person who has HPV needs to be 'in-tune' with their body and noticeable of these slight changes/indicators that occur a few days before the blisters/sores become appearant, as the disease might be infectious during that time as well, leading up to a visible outbreak.
But during the completely dormant periods of time, I do not believe HPV is contagious.
But the medical community states it can be passed on at any time, whether outbreaks are present or not ... my translation of that is, 'we don't know all there is we need to know about this disease, so to protect our own butts, we are giving a blanket-warning type of statement'.
- Response by andrewj5267
, A Guy Critical, Male, 36-45, Miami, Teaching